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PM, libnvdimm: Add runtime firmware activation support

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Abstract platform specific mechanics for nvdimm firmware activation
behind a handful of generic ops. At the bus level ->activate_state()
indicates the unified state (idle, busy, armed) of all DIMMs on the bus,
and ->capability() indicates the system state expectations for activate.
At the DIMM level ->activate_state() indicates the per-DIMM state,
->activate_result() indicates the outcome of the last activation
attempt, and ->arm() attempts to transition the DIMM from 'idle' to
'armed'.

A new hibernate_quiet_exec() facility is added to support firmware
activation in an OS defined system quiesce state. It leverages the fact
that the hibernate-freeze state wants to assert that a memory
hibernation snapshot can be taken. This is in contrast to a platform
firmware defined quiesce state that may forcefully quiet the memory
controller independent of whether an individual device-driver properly
supports hibernate-freeze.

The libnvdimm sysfs interface is extended to support detection of a
firmware activate capability. The mechanism supports enumeration and
triggering of firmware activate, optionally in the
hibernate_quiet_exec() context.

[rafael: hibernate_quiet_exec() proposal]
[vishal: fix up sparse warning, grammar in Documentation/]

Cc: Pavel Machek <pavel@ucw.cz>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Co-developed-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dan Williams 2020-07-20 15:08:18 -07:00 • committed by Vishal Verma
parent 5cf81ce189
commit 48001ea50d
8 changed files with 500 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

44
include/linux/libnvdimm.h
View file

@ -86,6 +86,7 @@ struct nvdimm_bus_descriptor {
int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *data);
const struct nvdimm_bus_fw_ops *fw_ops;
};
struct nd_cmd_desc {
@ -200,6 +201,49 @@ struct nvdimm_security_ops {
int (*query_overwrite)(struct nvdimm *nvdimm);
};
enum nvdimm_fwa_state {
NVDIMM_FWA_INVALID,
NVDIMM_FWA_IDLE,
NVDIMM_FWA_ARMED,
NVDIMM_FWA_BUSY,
NVDIMM_FWA_ARM_OVERFLOW,
};
enum nvdimm_fwa_trigger {
NVDIMM_FWA_ARM,
NVDIMM_FWA_DISARM,
};
enum nvdimm_fwa_capability {
NVDIMM_FWA_CAP_INVALID,
NVDIMM_FWA_CAP_NONE,
NVDIMM_FWA_CAP_QUIESCE,
NVDIMM_FWA_CAP_LIVE,
};
enum nvdimm_fwa_result {
NVDIMM_FWA_RESULT_INVALID,
NVDIMM_FWA_RESULT_NONE,
NVDIMM_FWA_RESULT_SUCCESS,
NVDIMM_FWA_RESULT_NOTSTAGED,
NVDIMM_FWA_RESULT_NEEDRESET,
NVDIMM_FWA_RESULT_FAIL,
};
struct nvdimm_bus_fw_ops {
enum nvdimm_fwa_state (*activate_state)
(struct nvdimm_bus_descriptor *nd_desc);
enum nvdimm_fwa_capability (*capability)
(struct nvdimm_bus_descriptor *nd_desc);
int (*activate)(struct nvdimm_bus_descriptor *nd_desc);
};
struct nvdimm_fw_ops {
enum nvdimm_fwa_state (*activate_state)(struct nvdimm *nvdimm);
enum nvdimm_fwa_result (*activate_result)(struct nvdimm *nvdimm);
int (*arm)(struct nvdimm *nvdimm, enum nvdimm_fwa_trigger arg);
};
void badrange_init(struct badrange *badrange);
int badrange_add(struct badrange *badrange, u64 addr, u64 length);
void badrange_forget(struct badrange *badrange, phys_addr_t start,